As alluded to by others, a gearbox in a car is just a solution for the limitations of the IC engine. Why would anyone want a gearbox in the transmission if it didn't need one?
The Jazz is the first auto I've actually owned, but spent a lot of my career concentrating mostly on autos (I was in engine engineering), so drove a lot of them. I'm quite happy with the stepped CVT, just not having to use a clutch is a blessing. It's a bit like manual chokes, manual advance/retard levers, crank handles etc, why would you want one if you had the option to do away with it?
I have a Honda bike with a "dual clutch transmission" (DCT). It's effectively an automated manual box, one clutch does gears 1,3,5 and the other does 2,4,6. You can use it in the various auto modes as supplied, but you also have the option of using it as a "manual" but just using the flappy paddles, so full manual control but without the hassle of a clutch. I love it, but some hate them. I wonder how much of it is the apparent macho-ness of actually heaving a clutch in and out, as opposed to the namby pamby push-button wimp device? I don't care, it works really well and is a godsend in heavy city traffic.
EV is the eventual way to go for sure, one pedal to go, one pedal to stop. The simpler the transmission the better. Why should it be any more complicated if it doesn't need to be? Mind you, there's always the nostalgia for vinyl records ...................